D50 black d4
Queen's Gambit Declined: Been-Koomen Variation
8 / 8
Use arrow keys to navigate
Opening Moves
1. d4 d5 2. c4 e6 3. Nc3 Nf6 4. Bg5 c5
Learn this Opening
Study the Queen's Gambit Declined: Been-Koomen Variation with spaced repetition. Our algorithm schedules reviews at optimal intervals so you never forget the key moves.